Fonctionnement hydrique d'un Technosol superficiel - application à une toiture végétalisée

Abstract : The sealing in cities highly degrades the buffer and filter functions of soils which generates and/or emphasizes major environmental issues (e.g. urban heat island, flooding, pollution of the runoff water). Among other technologies, advances in green roof engineering provide solutions for the management of urban rainwater. Indeed, green roofs can highly contribute to water regulation service by delaying run-off peaks and decreasing water fluxes to storm water collection network. The purpose of this work is to quantify and model the hydric performances of such an urban Technosol by taking into account the seasonal variations and the aging of the green roof. Physic and hydric measurements were conducted on the green roof constituents. Then, water fluxes and meteorological parameters were monitored in four green roofs parcels – including two with an innovative water storage structure – both at the lab and the building scales. Finally, the hydrodynamics of green roofs was modeled and numerically investigated with HYDRUS-1D in the framework of the Richards equations and the van Genuchten-Mualem model that describe unsaturated flows. As a result: i) the water flows inside these complex porous media were physically characterized, ii) the hydric performances of different parcels over three years, under Lorraine climate, were evaluated, iii) the model approach reached to a good description of the hydraulic behavior at the lab-scale but tends to underestimate in situ water fluxes. Beyond that, this work can provide a robust approach to simulate water transfer in green roofs under different climates or situations and may also contribute to further technological development
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Ryad Bouzouidja. Fonctionnement hydrique d'un Technosol superficiel - application à une toiture végétalisée. Autre. Université de Lorraine, 2014. Français. ⟨NNT : 2014LORR0232⟩. ⟨tel-01751237⟩

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